Plug Restrictor with surface channel(s)

Abstract

A plug restrictor has surface channel(s) made by etching or other means. The plug is either tapered to match with the tapered bore in the flow apparatus or straight to match with the straight bore of the flow apparatus. By pressing the plug restrictor into the bore of the flow apparatus, the restricting passageway(s) is(are) formed between the channel(s) on the plug surface and the inner peripheral surface of the bore of the flow apparatus.

What is claimed is: 
     
         1 . A plug restrictor for use in a conical bore of a flow apparatus for providing a laminar flow comprising:
 a primary body comprising an elongated bore, wherein at least a portion of it is conical, an inlet, an outlet and taps to communicate with a sensing device; and   a conical plug, with one or more surface channels, pressed into said elongated bore, wherein the one or more surface channels are configured to form flow passages extending between the inlet and the outlet along the inner peripheral surface of the conical bore.   
     
     
         2 . The plug restrictor of  claim 1 , wherein the trajectory of the one or more surface channels are hex. 
     
     
         3 . The plug restrictor of  claim 1 , wherein the one or more surface channels are straight, with a longitude direction coincident with the axis of the elongated bore. 
     
     
         4 . The plug restrictor of  claim 1 , wherein the outer peripheral surface of it forms an airtight contact with the inner peripheral surface of the elongated bore. 
     
     
         5 . A plug restrictor for use in a cylindrical bore of a flow apparatus for providing a laminar flow comprising:
 a primary body, with a cylindrical elongated bore, with inlet, outlet and taps to communicate with sensing device; and   a cylindrical plug, with one or more surface channels, pressed into said cylindrical elongated bore, wherein the one or more surface channels form flow passages for fluid with the inner peripheral surface of the cylindrical elongated bore.   
     
     
         6 . The plug restrictor of  claim 5 , wherein the trajectory of the one or more surface channels are hex. 
     
     
         7 . The plug restrictor of  claim 5 , wherein the one or more surface channels are straight, with a longitude direction that is coincident with the axis of the cylindrical elongated bore. 
     
     
         8 . The plug restrictor of  claim 5 , wherein an outer peripheral surface of it forms an airtight contact with the inner peripheral surface of the cylindrical elongated bore.